Global Patent Index - EP 2685474 A4

EP 2685474 A4 20150415 - RARE EARTH PERMANENT MAGNET AND PRODUCTION METHOD FOR RARE EARTH PERMANENT MAGNET

Title (en)

RARE EARTH PERMANENT MAGNET AND PRODUCTION METHOD FOR RARE EARTH PERMANENT MAGNET

Title (de)

SELTENERD-PERMANENTMAGNET UND VERFAHREN ZUR HERSTELLUNG DES SELTENERD-PERMANENTMAGNETEN

Title (fr)

AIMANT PERMANENT EN TERRE RARE ET PROCÉDÉ DE PRODUCTION D'UN AIMANT PERMANENT EN TERRE RARE

Publication

EP 2685474 A4 20150415 (EN)

Application

EP 12803430 A 20120315

Priority

  • JP 2011140909 A 20110624
  • JP 2011140913 A 20110624
  • JP 2012056701 W 20120315

Abstract (en)

[origin: US2013285778A1] There are provided a rare-earth permanent magnet and a manufacturing method thereof capable of preventing deterioration of magnet properties. In the method, magnet material is milled into magnet powder. Next, a mixture is prepared by mixing the magnet powder and a binder made of long-chain hydrocarbon and/or of a polymer or a copolymer consisting of monomers having no oxygen atoms. Next, the mixture is formed into a sheet-like shape so as to obtain a green sheet. After that, the green sheet is held for a predetermined length of time at binder decomposition temperature in a non-oxidizing atmosphere so as to remove the binder by causing depolymerization reaction or the like to the binder, which turns into monomer. The green sheet from which the binder has been removed is sintered by raising temperature up to sintering temperature. Thereby a permanent magnet 1 is obtained.

IPC 8 full level

H01F 1/08 (2006.01); B22F 1/102 (2022.01); B22F 1/103 (2022.01); B22F 3/02 (2006.01); B22F 3/10 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01); H02K 15/03 (2006.01)

CPC (source: EP KR US)

B22F 1/102 (2022.01 - EP KR US); B22F 1/103 (2022.01 - EP KR US); B22F 3/02 (2013.01 - EP KR US); B22F 3/1021 (2013.01 - EP KR US); B22F 3/16 (2013.01 - US); B22F 5/006 (2013.01 - US); C22C 38/002 (2013.01 - EP KR US); C22C 38/005 (2013.01 - EP KR US); H01F 1/0536 (2013.01 - US); H01F 1/0577 (2013.01 - EP US); H01F 1/06 (2013.01 - US); H01F 1/08 (2013.01 - KR); H01F 1/42 (2013.01 - US); H01F 41/0266 (2013.01 - EP KR US); B22F 2003/248 (2013.01 - US); B22F 2201/01 (2013.01 - EP KR US); B22F 2301/45 (2013.01 - US); B22F 2302/45 (2013.01 - US); B22F 2998/10 (2013.01 - EP KR US); B22F 2999/00 (2013.01 - EP KR US); C22C 2202/02 (2013.01 - EP KR US)

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

US 2013285778 A1 20131031; US 9281107 B2 20160308; CN 103081038 A 20130501; CN 103081038 B 20170308; EP 2685474 A1 20140115; EP 2685474 A4 20150415; EP 2685474 B1 20201223; EP 3786989 A1 20210303; HU E053709 T2 20210728; KR 101878998 B1 20180716; KR 20140036998 A 20140326; TW 201301312 A 20130101; TW I459410 B 20141101; US 2016141100 A1 20160519; US 2016196903 A1 20160707; US 9991033 B2 20180605; US 9991034 B2 20180605; WO 2012176509 A1 20121227

DOCDB simple family (application)

US 201213816344 A 20120315; CN 201280002740 A 20120315; EP 12803430 A 20120315; EP 20202238 A 20120315; HU E12803430 A 20120315; JP 2012056701 W 20120315; KR 20137003373 A 20120315; TW 101109955 A 20120322; US 201615007318 A 20160127; US 201615071406 A 20160316